JP2003195339A - Liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an arrester electrode ready to effectively operate without requiring high precision for relative positioning between two electrode substrates. <P>SOLUTION: A liquid crystal display panel is constituted by: connecting a layout wire 12 on the side of one electrode substrate 10 which is formed in a non-display area at the circumferential part of a seal material 30 and a dummy electrode 22 which is formed on the side of the other electrode substrate 20 opposite to it through conductive particles in the seal material; and providing the electrode substrates 10 and 20 with external electrodes 13 and 23 which are led into a seal material coated area from a substrate end surface and form arrester electrodes with an end part 12a of the layout wire and an end part 22a of the dummy electrode. The arrester electrodes P10a and P20a of the respective electrode substrates are shaped in a Λ shape which have abutting vertexes 12g and 13g, and 22g and 23g facing at one side of a boltlike pattern, and the arrester electrode P10a of one electrode substrate side and the arrester electrode P20a of the other electrode substrate side are arranged in opposite directions. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel, and more particularly to a liquid crystal display panel provided with electrostatic discharge means (arrester electrodes) capable of reducing display unevenness caused by static electricity as much as possible. Is.

[0002]

2. Description of the Related Art As shown in FIG.
The first electrode substrate 10 having the display electrodes 11 formed thereon and the second electrode substrate 20 having the display electrodes 21 facing the display electrodes 11 are pressure-bonded to each other with an epoxy-based sealing material 30 interposed therebetween.

In this case, the portion where the display electrode 11 and the display electrode 21 substantially face each other is the display region A which contributes to the actual display, and the peripheral portion of the sealing material 30 does not have the display electrodes which face each other. In the non-display area B, for example, the lead wiring of the display electrode is formed.

For the sake of design, the non-display area B may have a portion where the lead wiring exists and a portion where the lead wiring does not exist. Then, the gap between the display area A and the non-display area B is different, which may cause a difference in the background color between the display area A and the non-display area B.

Therefore, in the non-display area B, for example, when the first electrode substrate 10 has the lead wiring 12 but there is no second electrode substrate 20 facing the lead wiring 12, FIG. As illustrated, the second electrode substrate 2
The dummy electrode 22 facing the lead wiring 12 on the side of the first electrode substrate 10 is formed at 0 to make the gaps of both the display area A and the non-display area B uniform.

In this case, it is necessary to set the routing wiring 12 and the dummy electrode 22 to the same potential so that the liquid crystal is not driven in the non-display area B. Therefore, conductive particles as a transfer material are included in the sealing material 30 so that the routing wiring 12 and the dummy electrode 22 are electrically connected.

By the way, in manufacturing a liquid crystal display panel, static electricity is generated in various steps to charge the panel, but it is said that the amount of charge when the polarizing film is attached is the largest, and depending on the amount of charge, Discharge may occur between the display electrodes in the display area A, destroying the alignment control film in that portion, or breaking the display electrodes.

In order to prevent this, in this conventional example, an arrester electrode is provided in the application area of the sealing material 30 to discharge static electricity. The structure is shown in FIG.
Is shown in the perspective view of FIG.

The arrester electrode includes a first electrode substrate 10 and a second electrode substrate 10.
It is provided on both of the electrode substrates 20. That is, both the first electrode substrate 10 and the second electrode substrate 20 have their substrate end faces 10
The external electrodes 13 and 23 are drawn into the application area of the sealing material 30 from the a and 20a sides.

The external electrode 13 forms an arrester electrode P10 with the end portion of the lead wiring 12 formed on the first electrode substrate 10 side. Similarly, the external electrode 23 forms an arrester electrode P20 with the dummy electrode 22 formed on the second electrode substrate 20 side.

Referring also to the plan view of FIG. 5A, the arrester electrode P10 includes the end portion 13a of the external electrode 13 and the end portion 12a of the leading wiring 12, and the arrester electrode P20 includes the external electrode 23. The end portion 23a and the end portion 22a of the dummy electrode 22 are formed as chevron-shaped sharp projections and face each other.

It is an essential condition for the arrester that the inter-electrode gap between the arrester electrodes P10 and P20 is narrower than the line width between the lead wiring 12 and the dummy electrode 22, and is set to, for example, 5 to 10 μm. This allows
For example, when static electricity is greatly charged when the polarizing film is attached, one of the arrester electrodes P10 and P20 works effectively, and the static electricity is discharged in the application area of the sealing material 30.

[0013]

Since the lead-out wiring 12 and the dummy electrode 22 therefor are electrically connected through the conductive particles in the sealing material 30, the arrester electrodes P10, P are provided.
As shown in the plan view of FIG. 5A, one of 20 is arranged within the projected area of the other. That is, the relationship is such that they are vertically stacked.

Therefore, when the first electrode substrate 10 and the second electrode substrate 20 are pressure-bonded to each other, if a relative displacement occurs between them in the gap direction between the arrester electrodes, FIG.
As shown in the plan view of (b), for example, the second electrode substrate 20
Therefore, the external electrode 23 on the side and the leading wiring 12 on the side of the first electrode substrate 10 are electrically connected via the conductive particles in the sealing material 30.

This means that the lead-out wiring 12 on the first electrode substrate 10 side is exposed on the outer surface on the second electrode substrate 20 side, and the external electrode of the second electrode substrate 20 is used when the product is used thereafter. When 23 contacts another electric conductor, it causes a display disturbance.

To prevent this, from another viewpoint,
The positioning accuracy when the first electrode substrate 10 and the second electrode substrate 20 are bonded together is required to be higher than the interelectrode gap of the arrester electrodes P10 and P20 of 5 to 10 μm.

Therefore, an object of the present invention is to provide a technique for effectively operating an arrester electrode without requiring high precision in relative positioning between two electrode substrates.

[0018]

In order to solve the above-mentioned problems, the present invention comprises a first electrode substrate and a second electrode substrate which are pressure-bonded to each other with a sealing material interposed therebetween. Display wirings for the display electrodes are formed on the side of the first electrode substrate in the non-display area of the peripheral portion, and dummy electrodes facing the wirings are formed on the side of the second electrode substrate in the non-display area. In addition, the lead wiring and the dummy electrode are conducted by a transfer material included in the seal material, and each of the electrode substrates is drawn from the substrate end surface into the seal material application region, In a liquid crystal display panel in which external electrodes that form arrester electrodes are respectively provided between the ends of the lead-out wiring and the ends of the dummy electrodes, the array of each electrode substrate is arranged. Both Tha electrode has a vertex abutting face each other on one side of the band-shaped pattern,
It is characterized in that it is composed of a C-shaped electrode having a gradually increasing distance toward the other side, and the arrester electrode on the side of the first electrode substrate and the arrester electrode on the side of the second electrode substrate are arranged in opposite directions. There is.

According to a preferred aspect of the present invention, the first
The oblique side of the arrester electrode on the external electrode side of the electrode substrate and the oblique side of the arrester electrode on the dummy electrode side of the second transparent electrode are parallel to each other, and the oblique side of the arrester electrode on the external electrode side of the second electrode substrate and the oblique side. (1) The transparent electrode is parallel to the oblique side of the lead-out wiring side arrester electrode.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic perspective view showing an arrester electrode included in the present invention. 2A and 2B are plan views thereof, FIG. 2A shows a case where there is no deviation between the electrode substrates, and FIG. 2B shows a case where there is a deviation. For the basic configuration of the liquid crystal display panel according to this embodiment, refer to FIG. 3 described above.

Also in the present invention, the external electrodes 13 and 23 are drawn from the substrate end faces 10a and 20a of the first electrode substrate 10 and the second electrode substrate 20 into the coating region of the seal material 30,
The external electrode 13 forms the arrester electrode P10a facing the lead wiring 12, and the external electrode 23 is the dummy electrode 22.
To form an arrester electrode P20a.

The external electrodes 13 and 23, the lead-out wiring 12 and the dummy electrode 22 are all formed of ITO in the form of a strip pattern. In the present invention, the respective end portions forming the arrester electrodes are the same as in the above-mentioned conventional example. It is cut diagonally instead of a sharp mountain shape.

First, the arrester electrode P10a on the side of the first electrode substrate 10 will be described. Gap points (butting apexes) 12g and 13g are provided on one side of the strip-shaped pattern, and the end 12a of the routing wiring 12 and the outside are provided. On the end portion 13a of the electrode 13, oblique sides 12b and 13b are formed in which the distance gradually increases from the gap points 12g and 13g toward the other side of the strip-shaped pattern.

The arrester electrode P2 on the second electrode substrate 20 side
0a is also provided with the gap points 22g and 23g on one side of the strip-shaped pattern.
At the end portion 22a of the external electrode 23 and the end portion 23a of the external electrode 23, oblique sides 22b and 23b are formed, each of which the distance gradually increases from the gap points 22g and 23g toward the other side of the strip-shaped pattern.

The gap points 12g and 13g;
The distance between 22 g and 23 g is 5 to 10 as in the conventional example.
.mu.m and the hypotenuses 12b, 13b; 22
The opening angles of b and 23b may be arbitrarily selected, but the opening angles are preferably the same.

In this way, each arrester electrode P10a,
Both P20a are formed in a V shape, but FIG. 2 (a)
As shown in the plan view of 1, the arrester electrode P10a and the arrester electrode P20a are arranged in opposite directions.

That is, in FIG. 2A, if the gap points 12g and 13g of the arrester electrode P10a are arranged on the right side, the gap points 22g and 23g of the arrester electrode P20a are arranged on the opposite left side.

The oblique side 13b of the arrester electrode on the external electrode side of the first electrode substrate 10 and the oblique side 22b of the arrester electrode on the dummy electrode side of the second transparent electrode 20 are parallel to each other, and the external electrode side of the second electrode substrate 20. The hypotenuse 23 of the arrester electrode
It is preferable that b and the oblique side 12b of the lead-out wiring side arrester electrode of the first transparent electrode 10 are parallel to each other.

By setting the respective opening angles of the hypotenuses 12b, 13b; 22b, 23b to be the same, as described above, the hypotenuse 13
b and the hypotenuse 22b are parallel, and the hypotenuse 23b and the hypotenuse 1
In the present invention, the distance L between the oblique side 13b and the oblique side 22b (between the oblique side 23b and the oblique side 12b) along the direction of the gap between the arrester electrodes is the allowable deviation range.

That is, as shown in FIG. 2B, the first
When the electrode substrate 10 and the second electrode substrate 20 are pressure-bonded to each other, even if a relative positional deviation occurs in the gap between the arrester electrodes between them, if the positional deviation amount is less than the allowable range L, The lead wiring 12 on the side of the first electrode substrate 10 and the external electrode 23 on the side of the second electrode substrate 20, or the dummy electrode 22 on the side of the second electrode substrate 20 and the external electrode 13 on the side of the first electrode substrate 10 are inside the sealing material 30. No conductive particles are connected.

The permissible range L of the amount of positional deviation is the hypotenuse 12b,
13b; 22b, 23b are determined by the opening angle, and depending on the angle, the gap between the arrester electrodes can be set to several times, whereby high precision is not required for the alignment when the electrode substrates are pressure-bonded. , The arrester electrode can be effectively operated.

[0032]

As described above, according to the present invention,
The lead-out wiring on one electrode substrate side formed in the non-display area in the peripheral portion of the sealing material and the dummy electrode formed on the other electrode substrate side opposite to this are connected via conductive particles in the sealing material. Connected to each of the electrode substrates,
In the liquid crystal display panel, which is drawn from the end face of the substrate into the sealing material application region, and which is provided with external electrodes that form arrester electrodes between the end of the lead wiring and the end of the dummy electrode, each electrode substrate Both of the arrester electrodes of 1) have abutting vertices facing each other on one side of the strip-shaped pattern and have a gradually increasing distance toward the other side. By arranging the arrester electrode on the electrode substrate side in the opposite direction, it is possible to effectively operate the arrester electrode without requiring high accuracy in relative positioning between the two electrode substrates. it can.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an arrester electrode included in the present invention.

FIG. 2 is a plan view showing both states of the case where the arrester electrode is not displaced and the case where the arrester electrode is displaced.

FIG. 3 is a schematic vertical sectional view showing a conventional example of a liquid crystal display panel.

FIG. 4 is a schematic perspective view showing an arrester electrode provided in the conventional example.

FIG. 5 is a plan view showing both states in the case where there is no displacement of the arrester electrode in the above-mentioned conventional example and in the case where there is displacement.

[Explanation of symbols]

10 First electrode substrate 11 Display electrode 12 routing wiring 20 Second electrode substrate 21 Display electrode 22 Dummy electrode 30 sealing material 10a, 20a substrate end face 13,23 External electrode 12b, 13b, 22b, 23b hypotenuse 12g, 13g, 22g, 23g Gap point P10a, P20a arrester electrode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuki Yanagi             2-3 2-3 Higashi Zao, Nagaoka City, Niigata Japan             Within Seiki Co., Ltd. F-term (reference) 2H092 GA32 GA61 GA64 NA14 PA04                 5C094 AA03 AA42 BA43 EA01 EA02                       EA10 FA01 HA08

Claims (2)

[Claims] 1. A first electrode substrate and a second electrode substrate are pressure-bonded to each other with a sealing material interposed therebetween, and the first electrode substrate side is provided in a non-display area around the sealing material in the cell gap. A lead wire for the display electrode is formed, and a dummy electrode facing the lead wire is formed on the second electrode substrate side in the non-display area, and the lead wire and the dummy electrode are the sealing material. Is conducted by a transfer material included in the electrode substrate, is drawn into each of the electrode substrates from the end face of the substrate into the seal material application region, and is between the end of the lead wiring and the end of the dummy electrode. Thus, in the liquid crystal display panel provided with the external electrodes forming the arrester electrodes, the arrester electrodes of each of the above-mentioned electrode substrates are arranged on one side of the strip pattern. And an abutment electrode facing the first electrode substrate side and an arrester electrode on the second electrode substrate side opposite to each other. A liquid crystal display panel characterized by being arranged. 2. The oblique side of the external electrode side arrester electrode of the first electrode substrate and the oblique side of the dummy electrode side arrester electrode of the second transparent electrode are parallel to each other, and the external electrode of the second electrode substrate. The liquid crystal display panel according to claim 1, wherein a hypotenuse of the side arrester electrode and a hypotenuse of the lead wiring side arrester electrode of the first transparent electrode are parallel to each other.